In S1E11, Rory tells Luke the story about when Lorelai stuffed Kleenexes into their hamsters cage until it was full, then dropped the cage off at the pet store and ran away. Lorelai says, defensively, “Look, I know it was bad, but this was a vicious hamster! This was like a Damien hamster with little beady eyes and a big forked tail and a cape with a hood and, ugh…”
The Omen was a 1976 horror film about a couple who adopts a child, Damien, who is surrounded by creepy and mysterious events. Damien turns out to be the Antichrist.